Control slump and moisture in your product by measuring the raw materials
Moisture measurement is an inexact science. Different sensor types must be used for different materials and environments. The best environment is a bin or hopper where the material is compacted. This gives reliable density and best accuracy. Also, small granule size, compared with the measurement aperture, gives better accuracy. We offer three types of sensor for different environments:
The best choice for measurement of granular materials such as sand and small aggregates (up to 1/4″ or 6 mm) or similar products that can be compacted inside a bin or hopper. The material flows past the sensor and its moisture is averaged during the flow period. This gives a better average than obtained from oven-dry tests. It can also be used in a ‘ski’ fixture that rides on top of a thick bed of material on a conveyor belt, but with reduced accuracy. The ONLY moisture sensor with a 10 year guarantee!
For use in mixers for concrete and similar applications, AquaMix uses the hardest known material after diamond, Silicon Nitride, for its faceplate. This gives over 10 years of life with extreme aggregates such as granite used daily in mixing of concrete. The sensor is embedded in the floor of pan, ribbon or twin-shaft mixers using a fixture that allows adjustment for the wear of the liner plates. Both AquaSense and AquaMix use the same setup and calibration software.
If a batch controller is not used or does not have mixer moisture software, AquaControl controls the addition of water, based on readings from the AquaMix sensor. It connects to the water valves and meter. Three different methods are available to measure and add the water, depending on the application.
This sensor uses near-infrared light to measure the surface moisture of sand, aggregates and other granular materials as they pass by on a belt or flow out of a hopper. Polarmoist is the only system that can measure the surface moisture of large aggregates (greater than 3/8″ or 10 mm). Capacitance and microwave methods show too much variation. Polarmoist is not a Scale-Tron manufactured item but is available for these special applications.